Tappet



J.`c.,REAvEs.

TAPPET.

Patented Feb. 7, 1922.

IN V EN TOR.

f6 x70/an CRem/es l BY Q m ATTORNEY UNITED -sTATEs PATE-NT O1-Fles Y (JOHN c. REAvns,y or PLYMOUTIL, onmronmn;

Tov all whom t may concern.'

-Be it known that I, JOHN C'. REAvEs, .a citizen of theA United States,` residing at Plymouth, in the county of Amador, State of California7 have invented certainnew and-usefulv Improvements in Tappets.; and I do declare the following to be a full, clear,

yand exactl description of the sameyreference being had to the accompany-ing drawings, and to the characters of referencevmarked thereon,` which forni a partof this application. f

T his invention relates to improvements in tappets of the .kind universally 'used in lcon- `iiection with ore-stamps, the principal ob ject being to provide laV tappet Vofthe .gib

hened on their'outer ends'and-adapted'to'reand keytypewhich may be positively-and easily locked to the shaft .or stem of the stamp at anypredetermined point thereon position on the shaft.' l Y 1 f Another object is to so arrange and' con# structthe partsofthe tappet, thatthe frictional engagementV ofv the shaft therewith will extend with even .pressurel over a greater partv of the height of the tappet, so that it .will cling to the shaft Vwith less cinching upto withstand the heavy strain incident to its use than isnecessarywith the ordinary type of gib and key tappetf'in vand which is readily loosened to adjust its which the binding engagement Vwith the shaft is had only at a plurality of points instead ofover a continuous area.

It is this defect inthe` design of'the present Vstyle of tappet that'causes them to fracture around the keyways, since on account of limitations of space, the surrounding metal cannot be made ofa thicknesssuicient to long withstand the wedging strain and the constant ing cams.

I feel that-with vmy improved form of tappet. I have overcome the objectionable features pointed out above, and yet the enhammering ofthe actuatvtire structure will be `no more bulky or weighty than the present forms.

A further object of the invention is to produce a `simple and inexpensive device, and vet one which wili be exceedingly etfective for the purposes for which itis designed.

.Ihesc'objects i accomplish by means of Y such structure and relative arrangement of parts as will fully appear byra'perus'al of the following specification and claims.

p Y i Specification of Letters Patent, Patented` Feb. ,1.922. 'Application nica June 2, 1920. senaiNo. 386,117. l i

In the drawings similar Vcharacters of ref-l erence indicate corresponding parts inthe several views. v V j Fig. 1 is a side elevation of the tappet,jinz engagementwitha shaft. f

F 2 is a vertical section thereof. l

A Fig. 3 is a cross section on a line 3--3 of Fig; 1. f

. Fig. 4 isa vertical-section taken fon ailin'e 4-4ofFig.2. v l f Fig. 5 is an elevation of one of the "gi-bs 10.

Refer-ring now. more particularly to the characters of reference on the drawings,Y the numera'lrl de notes` the body of-the tappet inv general, consisting of a sleeve 72 at leach end of which are enlarged portions 3 hard-y tov to provide suicient metal for -iny purpose;

The body 1 is bored lengthwise for the rei ception of the shaft or stem 5, that half of the bore adjacent the boss being on a center eccentric from the vcenter of the stem Aand toward'the boss, sothat on that side a-clear ance is had between the stem and 'the bore,` as shown at 6. v 1 Cut or cored in the boss 4 lengthwise'of the shaft is .a pocket-7, whose sides are parallel, and the' back ofwhich `tapers toward the shaft from 'thecenter tothe ends."

Y -A- transverse straight 'keyw-ay 8 in the boss cuts through this pocket central of its length,` being open .at each end. Similar but smaller keyways 9 are end ofthe pocket. f l Slidable in the pocket are similar but opposed ygibsy 10 one Vface of the same being tapered as atv 11 to contact with `the tapered wall of the pocket, and the opposed face being concavely curved ,as at 12 tol fit around the shaft 5 and having the same curvature thereas.

The adjacent ends of the gibs are spaced apart somewhat even when they are loosened, and such ends then project into the keyway S ,and arefta-pe'red in opposite directions as shown at 13 to form a wedge-shaped seat therebetween to receive the similarly tapered edges of a driving key 14 thereagainst. TheV initial portion of this key however is tapered to a greater degree than the remainder,l

positioned ,at leach j as shown at 15, since when first driving the gibs apart not so much force is necessary as when they are nearly snug on the shaft, and

`hence the initial movement thereof may be quicker.

The opposite ends of the ibs are also tapered as at 16 .and project into the key-Y ways 9, such tapered edges being'parallel to the other tapered edges 13, so that while,`

the Ikey 14 is driven in from one side of the bossvto tightenthe gibs, the loosening keysor drifts such as are commonly7 used for the purpose, must be driven in from the oppositeside.' l

In operation then, to loosen theftappet, a

' man on one side thereof strikes on thevkey 14 to retract the same, and fromthe same sidedrives in the gib-loosening drifts, when thetappet may be adjusted on its stem. A man on the other side of the tappet then knocks out the drifts and hammers the driving key 14back into place to force the gibs apart. The wide ends of the members 1U are l flattened transversely as at 11a, or parallel to the borefthereof, in .order to provide ample clearance from the walls of the keyway 8.

. vFrom theforegoing description it will .be

readilyfseenl that I have produced such a device as substantiall fulfills the object of the invention as set orth herein.

While this specification sets forth in detail thev present and preferred construction of the device still in practice such deviations from such detail may be resorted to as do not forma departure from the spirit ofthe invention, as defined by the appended claims.

' Having thus described my invention what between such tapered ends to force the gibs' apart, and transverse keyways at the ends o the pocket, the opposite ends of the gibs projectin thereinto and being tapered parallel to t e other end thereof, whereby to loosen the gibs when driven apart by the key, drifts must be driven into the keyways from the side thereof opposite to the direc,- tion of driving of the key.

`2. A tappet comprisin a body bored to surround a shaft, a pocret formed inthe body lengthwise thereof communicating with the bore and whose inner edge tapers towards the bore from central of its lengthtoward the ends, similarly tapered gibs slidably seated in the pocket shaped to partially encircle the shaft, a transverse keyway in the body cutting through the pocket central of its length and into which the adjacent ends of the gibs project, `a key adapted -tobe inserted into the keyway from one side there of to force vthe gibs apart, and transverse keyways at each end of the pocket and into l which the gibs protrude, these ends of the ibs being tapered so as to be engaged by drifts inserted into the vlatter keyways from the direction opposite to that of the inser'- -tion of the key.

3. A tappet comprising a body bored to surround a shaft, a pair of gibs mounted in the body adjacent the bore and in longitudinally opposed order, being adapted to enadjacent ends thereofbeing oppositely tapered, and a double-tapered key adapted to be drivenk between the gibs, the` ini-tial. end of the key for a distanceapproximately onequarter of its length having a greater de grec oftaper than the 'remainder .j

4.' A tappet comprising a body bored'to surround a shaft, a pair of gibs mounted in the body adjacent the boreV` and in longitudinally opposed order, being adapted to ga e Athe shaft when forced apart and the j 'i engage the shaft when forced apart, a key Y' adapted to be driven between the gibs, transverse keyways in the body at the vopposite ends of the gibs and into which the latter protrude, these ends of the gibs beinea adapted to be engaged by driftsv inserted into the keyways to loosen the gibs, and means whereby such drifts must be inserted from the opposite side of the body Vfrom which the key is driven between the gibs.

In testimony whereof I afliX my signature.

' JOHN C. REAVES 

